Right side=have their hair pulled across from the left side of their head to the right.
Left side =have their hair pulled across from the right side of their head to the left.
Above for left side of head. (pinch on left and open on right).
Above is for right side (pinch on right and open on left)
For pigtails, it doesn't matter which direction. Here is an example--the 'right' clip on left side pigtail:
The simple way is to try it on your DD (or yourself). It shouldn't be upside down.
And most of the hairbow/hair clips are for both side: